diff --git a/src/ltui/base/bit.lua b/src/ltui/base/bit.lua
index 7d2bc65..a900d13 100644
--- a/src/ltui/base/bit.lua
+++ b/src/ltui/base/bit.lua
@@ -31,5 +31,10 @@ function bit.bor(a, b)
     return a | b
 end
 
+-- bit/xor operation
+function bit.bxor(a, b)
+    return a ~ b
+end
+
 -- load bit module
 return bit